More than forty years ago，John William gave away what he had and went off to the mountains to live the way people live one hundred years ago．For 1 he catches wild animals，fishes in the river，and plants what he can．John lives in a 2 house he made by hand，out of trees he cut down with an axe(斧子)．Nobody lives within fifty miles of his house in the mountains and John has not been out of the mountain during the 3 years．One day last year I hiked in to see 4 John lives．It was like 5 in time．There were no roads，no stores，no noise，not even a post office．
Most notable of all，there were no people and that's just the 6 John Williams wants to keep his part of the world—without people．John is a learned man．He has 7 and nobody knows how he got them．Mostly he reads about his world，the animals，the 8 and the mountains．He has seen planes flying overhead 9 doesn't want to know about 10 ．John William is eighty-five years old and has not had a sick day in his life．
One day I was visiting one of my friends in a big town． Suddenly 1 beautiful music came to my ears． My friend’s father quickly picked up 2 and went outside． I asked my friend，“ 3 ？”My friend said that there was a truck 4 rubbish outside．
“ 5 someone throws in some rubbish，it gives out beautiful music． 6 other people hear it，they go out with their rubbish and 7 ”
“It is a 8 way to help keep our city clean．”said my friend．
9 our environment(环境) is very important． Wherever you 10 ，you can do something around your neighborhood．
Have you ever thrown any litter onto the ground? Have you ever draw pictures on 11 ? Have you ever spat 12 a public place? Have you ever cut down trees? If your answers are “ 13 ”，it means that you have already helped protect our environment．
It is our duty to keep our environment 14 ． 15 everyone tries his best to protect(保护) the environment，the world will become much more beautiful．
